Boiler plug



June 5, 1923. 11,457,913

P. E. MCINTOSH ET AL BOILER PLUG Filed Sept. 25, 1921 INVEYTOR. Pefer f.Nflnfosh Eusse/l O'Go/me/l i. In a structure of the class described, thecombination of a screw bushing with a bearing seat at its outer end andan inner end divided into opposed symmetrical spiral surfaces withlongitudinal slots leading thereto, a plug with a flanged bearing to fitthe hearing at the outer end of the ,bushing and with longitudinallyprojecting opposed lugs adapted to pass through the longitudinal slotsand engage the said spiral surfaces, a square projection on the plug forturning the same, a transversely projecting plate carrying a curvedsegment with aseries of screw holes, a set screw for insertion throughthe said segment to lock the plug in closed position, and a lock nut forthe set screw, as specified.

2. In a structure of the class described, the combination of a bushingwith a bearing seat at its end and an inner end divided into opposedsymmetrical spiral surfaces with longitudinal slots leading thereto, aplug with a flanged bearing to fit the bearing at the outer end of thebushing and with longitudinally projecting opposed lugs adapted to passthrough the longitudinal slots and engage the said spiral surfaces, asquare projection on the plug for turning the same, a transverselyprojecting part, and a set screw for insertion through the said part forlocking the plug in closed position, as specified.

3. In a structure of the class described, the combination of a bushingwith a hear ing seat at its outer end "and an inner end divided intoopposed symmetrical spiral surfaces with longitudinal slots leadingthereto, a plug with a flanged bearing to fit the bearing at the outerend of the bushing and with longitudinally projecting opposed lugsadapted to pass through the longitudinal slots and engage the saidspiral surfaces, a transversely projecting part, and a set screw forinsertion through the said part for locking the plug in closed position,as specified.

4. In a structure of the class described, the combination of a bushingwith a bearing seat at its outer end and inner end divided into opposedsymmetrical spiral surfaces on its inner face with longitudinal slotsleading thereto, a plug with a flanged bearing to fit the bearing at theouter end of the bushing and with longitudinally projecting opposed lugsadapted to pass through the longitudinal slots and engage the saidspiral surfaces, and "set screw means to lock said plug against rotationto secure it in place. 5. In a structure of the class described, thecombination of a bushing with a bearing seat at its outer end and aninner end divided into opposed symmetrical spiral surfaces on its innerface with longitudinal slots leading thereto, aplug with a flangedbearing to fit the bearing at the outer end of the bushing and withlongitudinally projectlng opposed lugs adapted to pass through thelongitudinal slots and engage the said spiral surfaces, and an externalmanually manipulated means for securing said plug against rotation.

6. In a boiler plug, the combination with a one piece externallythreaded bushing having its outer end faced to provide a bearing seatand its inner end conformed to provide oppositely disposed symmetricalspiral surfaces, said bushing having opposed internal longitudinalgrooves extending from end to end thereof and leading to said spiralsurfaces, and a one piece plug having a peripheral flange at its outerend,

faced on its inner side to coact Withsaid bearing seat of said bushing,said plug having opposed lugs adapted to be introduced through the saidlongitudinal grooves of said bushing into engagement withthe said spiralsurfaces thereof whereby the hearing faces of said bushing and plug" areclamped together by a rotative movement of the plug, said plug beingadapted to re ceive a wrench.

In witness whereof, we have hereunto'set our hands and seals in thepresence of two witnesses.

PETER E. McINTOSI-I. RUSSELL OCONNELL. Witnesses:

ALLEN H. Lemon, NICHOLAS 0. Snow,

